由于安装系统的时候，给/boot单独划了一块分区（200M），导致ubuntu更新系统的时候提示boot分区不足，如下图所示：
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查看磁盘空间情况（关注/boot分区，只剩下53M）
~$ df -h 文件系统 容量 已用 可用 已用% 挂载点 udev 3.9G 0 3.9G 0% /dev tmpfs 784M 2.0M 782M 1% /run /dev/sda5 59G 23G 34G 41% / tmpfs 3.9G 216M 3.7G 6% /dev/shm tmpfs 5.0M 4.0K 5.0M 1% /run/lock tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/loop1 89M 89M 0 100% /snap/core/7270 /dev/loop2 203M 203M 0 100% /snap/vlc/1397 /dev/loop4 15M 15M 0 100% /snap/gnome-characters/375 /dev/loop0 3.8M 3.8M 0 100% /snap/gnome-system-monitor/123 /dev/loop5 150M 150M 0 100% /snap/gnome-3-28-1804/67 /dev/loop6 55M 55M 0 100% /snap/core18/1650 /dev/loop7 4.3M 4.3M 0 100% /snap/gnome-calculator/544 /dev/loop3 161M 161M 0 100% /snap/gnome-3-28-1804/116 /dev/loop8 1.0M 1.0M 0 100% /snap/gnome-logs/61 /dev/loop10 1.0M 1.0M 0 100% /snap/gnome-logs/81 /dev/loop9 45M 45M 0 100% /snap/gtk-common-themes/1440 /dev/loop11 3.8M 3.8M 0 100% /snap/gnome-system-monitor/127 /dev/loop12 55M 55M 0 100% /snap/core18/1668 /dev/loop13 15M 15M 0 100% /snap/gnome-characters/399 /dev/loop14 90M 90M 0 100% /snap/core/8268 /dev/loop15 68M 68M 0 100% /snap/sublime-text/85 /dev/loop16 45M 45M 0 100% /snap/gtk-common-themes/1353 /dev/loop17 4.2M 4.2M 0 100% /snap/gnome-calculator/406 /dev/sda6 181M 115M 53M 69% /boot /dev/sda3 96M 31M 66M 33% /boot/efi tmpfs 784M 20K 784M 1% /run/user/121 tmpfs 784M 52K 784M 1% /run/user/1000 -
查看系统中已安装的linux-image各个版本，使用命令：
~$ dpkg --get-selections|grep linux- binutils-x86-64-linux-gnu install linux-base install linux-firmware install linux-generic-hwe-18.04 install linux-headers-5.3.0-26 install linux-headers-5.3.0-26-generic install linux-headers-5.3.0-28 install linux-headers-5.3.0-28-generic install linux-headers-generic-hwe-18.04 install linux-image-5.3.0-26-generic install linux-image-5.3.0-28-generic install linux-image-generic-hwe-18.04 install linux-libc-dev:amd64 install linux-libc-dev:i386 install linux-modules-5.3.0-26-generic install linux-modules-5.3.0-28-generic install linux-modules-extra-4.15.0-74-generic deinstall linux-modules-extra-5.3.0-26-generic install linux-modules-extra-5.3.0-28-generic install linux-signed-generic-hwe-18.04 install linux-sound-base installdeinstall的表示已经卸载了的
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查看当前内核版本
~$ uname -a Linux jarrod-ThinkPad 5.3.0-28-generic #30~18.04.1-Ubuntu SMP Fri Jan 17 06:14:09 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux -
卸载多余的旧版本内核（用remove会留下deinstall标记，用purge）
~$ sudo apt-get purge linux-image-5.3.0-26-generic -
此时不知道为啥会自动安一个unsigned的image，卸载之
sudo apt-get purge linux-image-unsigned-5.3.0-26-generic -
再次查看内核状态
~$ dpkg --get-selections|grep linux- binutils-x86-64-linux-gnu install linux-base install linux-firmware install linux-generic-hwe-18.04 install linux-headers-5.3.0-28 install linux-headers-5.3.0-28-generic install linux-headers-generic-hwe-18.04 install linux-image-5.3.0-28-generic install linux-image-generic-hwe-18.04 install linux-libc-dev:amd64 install linux-libc-dev:i386 install linux-modules-5.3.0-26-generic install linux-modules-5.3.0-28-generic install linux-modules-extra-5.3.0-28-generic install linux-signed-generic-hwe-18.04 install linux-sound-base install -
再次查看磁盘状态
~$ df -h 文件系统 容量 已用 可用 已用% 挂载点 udev 3.9G 0 3.9G 0% /dev tmpfs 784M 2.0M 782M 1% /run /dev/sda5 59G 23G 34G 41% / tmpfs 3.9G 216M 3.7G 6% /dev/shm tmpfs 5.0M 4.0K 5.0M 1% /run/lock tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/loop1 89M 89M 0 100% /snap/core/7270 /dev/loop2 203M 203M 0 100% /snap/vlc/1397 /dev/loop4 15M 15M 0 100% /snap/gnome-characters/375 /dev/loop0 3.8M 3.8M 0 100% /snap/gnome-system-monitor/123 /dev/loop5 150M 150M 0 100% /snap/gnome-3-28-1804/67 /dev/loop6 55M 55M 0 100% /snap/core18/1650 /dev/loop7 4.3M 4.3M 0 100% /snap/gnome-calculator/544 /dev/loop3 161M 161M 0 100% /snap/gnome-3-28-1804/116 /dev/loop8 1.0M 1.0M 0 100% /snap/gnome-logs/61 /dev/loop10 1.0M 1.0M 0 100% /snap/gnome-logs/81 /dev/loop9 45M 45M 0 100% /snap/gtk-common-themes/1440 /dev/loop11 3.8M 3.8M 0 100% /snap/gnome-system-monitor/127 /dev/loop12 55M 55M 0 100% /snap/core18/1668 /dev/loop13 15M 15M 0 100% /snap/gnome-characters/399 /dev/loop14 90M 90M 0 100% /snap/core/8268 /dev/loop15 68M 68M 0 100% /snap/sublime-text/85 /dev/loop16 45M 45M 0 100% /snap/gtk-common-themes/1353 /dev/loop17 4.2M 4.2M 0 100% /snap/gnome-calculator/406 /dev/sda6 181M 67M 101M 40% /boot /dev/sda3 96M 31M 66M 33% /boot/efi tmpfs 784M 20K 784M 1% /run/user/121 tmpfs 784M 52K 784M 1% /run/user/1000